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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <!-- var const let  -->
    <script>
        const obj = {
            name: "ctx",
            age: 18
        }
        obj.name = "ansel";
        obj.sex = "male";
        console.log(obj.sex)

    </script>
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